forked from luck/tmp_suning_uos_patched
Tracing fixes:
- Check kprobe is enabled before unregistering from ftrace as it isn't registered when disabled. - Remove kprobes enabled via command-line that is on init text when freed. - Add missing RCU synchronization for ftrace trampoline symbols removed from kallsyms. - Free trampoline on error path if ftrace_startup() fails. - Give more space for the longer PID numbers in trace output. - Fix a possible double free in the histogram code. - A couple of fixes that were discovered by sparse. -----BEGIN PGP SIGNATURE----- iIkEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCX2lEchQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qokAAQDphHFTOlgjKi7lF7bc5V1bl/MT1bVo bJRHV8w2agtXMgD49ElFOl6znXqid3X++0dYZ5/AQgOZXf1rsYS05Pj0Dw== =+cVX -----END PGP SIGNATURE----- Merge tag 'trace-v5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: - Check kprobe is enabled before unregistering from ftrace as it isn't registered when disabled. - Remove kprobes enabled via command-line that is on init text when freed. - Add missing RCU synchronization for ftrace trampoline symbols removed from kallsyms. - Free trampoline on error path if ftrace_startup() fails. - Give more space for the longer PID numbers in trace output. - Fix a possible double free in the histogram code. - A couple of fixes that were discovered by sparse. * tag 'trace-v5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: bootconfig: init: make xbc_namebuf static kprobes: tracing/kprobes: Fix to kill kprobes on initmem after boot tracing: fix double free ftrace: Let ftrace_enable_sysctl take a kernel pointer buffer tracing: Make the space reserved for the pid wider ftrace: Fix missing synchronize_rcu() removing trampoline from kallsyms ftrace: Free the trampoline when ftrace_startup() fails kprobes: Fix to check probe enabled before disarm_kprobe_ftrace()
This commit is contained in:
Linus Torvalds
commit
eff48ddeab
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@ -373,6 +373,8 @@ void unregister_kretprobes(struct kretprobe **rps, int num);
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void kprobe_flush_task(struct task_struct *tk);
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void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
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void kprobe_free_init_mem(void);
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int disable_kprobe(struct kprobe *kp);
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int enable_kprobe(struct kprobe *kp);
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@ -435,6 +437,9 @@ static inline void unregister_kretprobes(struct kretprobe **rps, int num)
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static inline void kprobe_flush_task(struct task_struct *tk)
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{
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}
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static inline void kprobe_free_init_mem(void)
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{
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}
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static inline int disable_kprobe(struct kprobe *kp)
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{
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return -ENOSYS;
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@ -33,6 +33,7 @@
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#include <linux/nmi.h>
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#include <linux/percpu.h>
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#include <linux/kmod.h>
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#include <linux/kprobes.h>
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#include <linux/vmalloc.h>
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#include <linux/kernel_stat.h>
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#include <linux/start_kernel.h>
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@ -303,7 +304,7 @@ static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum)
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#ifdef CONFIG_BOOT_CONFIG
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char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
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static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
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#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
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@ -1402,6 +1403,7 @@ static int __ref kernel_init(void *unused)
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kernel_init_freeable();
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/* need to finish all async __init code before freeing the memory */
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async_synchronize_full();
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kprobe_free_init_mem();
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ftrace_free_init_mem();
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free_initmem();
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mark_readonly();
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@ -2162,9 +2162,10 @@ static void kill_kprobe(struct kprobe *p)
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/*
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* The module is going away. We should disarm the kprobe which
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* is using ftrace.
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* is using ftrace, because ftrace framework is still available at
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* MODULE_STATE_GOING notification.
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*/
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if (kprobe_ftrace(p))
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if (kprobe_ftrace(p) && !kprobe_disabled(p) && !kprobes_all_disarmed)
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disarm_kprobe_ftrace(p);
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}
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@ -2459,6 +2460,28 @@ static struct notifier_block kprobe_module_nb = {
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extern unsigned long __start_kprobe_blacklist[];
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extern unsigned long __stop_kprobe_blacklist[];
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void kprobe_free_init_mem(void)
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{
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void *start = (void *)(&__init_begin);
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void *end = (void *)(&__init_end);
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struct hlist_head *head;
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struct kprobe *p;
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int i;
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mutex_lock(&kprobe_mutex);
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/* Kill all kprobes on initmem */
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for (i = 0; i < KPROBE_TABLE_SIZE; i++) {
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head = &kprobe_table[i];
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hlist_for_each_entry(p, head, hlist) {
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if (start <= (void *)p->addr && (void *)p->addr < end)
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kill_kprobe(p);
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}
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}
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mutex_unlock(&kprobe_mutex);
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}
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static int __init init_kprobes(void)
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{
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int i, err = 0;
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@ -2782,6 +2782,7 @@ static void ftrace_remove_trampoline_from_kallsyms(struct ftrace_ops *ops)
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{
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lockdep_assert_held(&ftrace_lock);
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list_del_rcu(&ops->list);
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synchronize_rcu();
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}
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/*
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@ -2862,6 +2863,8 @@ int ftrace_startup(struct ftrace_ops *ops, int command)
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__unregister_ftrace_function(ops);
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ftrace_start_up--;
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ops->flags &= ~FTRACE_OPS_FL_ENABLED;
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if (ops->flags & FTRACE_OPS_FL_DYNAMIC)
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ftrace_trampoline_free(ops);
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return ret;
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}
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@ -3782,14 +3782,14 @@ unsigned long trace_total_entries(struct trace_array *tr)
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static void print_lat_help_header(struct seq_file *m)
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{
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seq_puts(m, "# _------=> CPU# \n"
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"# / _-----=> irqs-off \n"
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"# | / _----=> need-resched \n"
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"# || / _---=> hardirq/softirq \n"
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"# ||| / _--=> preempt-depth \n"
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"# |||| / delay \n"
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"# cmd pid ||||| time | caller \n"
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"# \\ / ||||| \\ | / \n");
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seq_puts(m, "# _------=> CPU# \n"
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"# / _-----=> irqs-off \n"
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"# | / _----=> need-resched \n"
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"# || / _---=> hardirq/softirq \n"
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"# ||| / _--=> preempt-depth \n"
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"# |||| / delay \n"
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"# cmd pid ||||| time | caller \n"
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"# \\ / ||||| \\ | / \n");
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}
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static void print_event_info(struct array_buffer *buf, struct seq_file *m)
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@ -3810,26 +3810,26 @@ static void print_func_help_header(struct array_buffer *buf, struct seq_file *m,
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print_event_info(buf, m);
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seq_printf(m, "# TASK-PID %s CPU# TIMESTAMP FUNCTION\n", tgid ? "TGID " : "");
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seq_printf(m, "# | | %s | | |\n", tgid ? " | " : "");
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seq_printf(m, "# TASK-PID %s CPU# TIMESTAMP FUNCTION\n", tgid ? " TGID " : "");
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seq_printf(m, "# | | %s | | |\n", tgid ? " | " : "");
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}
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static void print_func_help_header_irq(struct array_buffer *buf, struct seq_file *m,
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unsigned int flags)
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{
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bool tgid = flags & TRACE_ITER_RECORD_TGID;
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const char *space = " ";
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int prec = tgid ? 10 : 2;
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const char *space = " ";
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int prec = tgid ? 12 : 2;
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print_event_info(buf, m);
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seq_printf(m, "# %.*s _-----=> irqs-off\n", prec, space);
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seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space);
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seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space);
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seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space);
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seq_printf(m, "# %.*s||| / delay\n", prec, space);
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seq_printf(m, "# TASK-PID %.*sCPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID ");
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seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | ");
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seq_printf(m, "# %.*s _-----=> irqs-off\n", prec, space);
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seq_printf(m, "# %.*s / _----=> need-resched\n", prec, space);
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seq_printf(m, "# %.*s| / _---=> hardirq/softirq\n", prec, space);
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seq_printf(m, "# %.*s|| / _--=> preempt-depth\n", prec, space);
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seq_printf(m, "# %.*s||| / delay\n", prec, space);
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seq_printf(m, "# TASK-PID %.*s CPU# |||| TIMESTAMP FUNCTION\n", prec, " TGID ");
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seq_printf(m, "# | | %.*s | |||| | |\n", prec, " | ");
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}
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void
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@ -3865,7 +3865,6 @@ static int parse_var_defs(struct hist_trigger_data *hist_data)
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s = kstrdup(field_str, GFP_KERNEL);
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if (!s) {
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kfree(hist_data->attrs->var_defs.name[n_vars]);
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ret = -ENOMEM;
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goto free;
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}
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@ -497,7 +497,7 @@ lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
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trace_find_cmdline(entry->pid, comm);
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trace_seq_printf(s, "%8.8s-%-5d %3d",
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trace_seq_printf(s, "%8.8s-%-7d %3d",
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comm, entry->pid, cpu);
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return trace_print_lat_fmt(s, entry);
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@ -588,15 +588,15 @@ int trace_print_context(struct trace_iterator *iter)
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trace_find_cmdline(entry->pid, comm);
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trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
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trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
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if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
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unsigned int tgid = trace_find_tgid(entry->pid);
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if (!tgid)
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trace_seq_printf(s, "(-----) ");
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trace_seq_printf(s, "(-------) ");
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else
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trace_seq_printf(s, "(%5d) ", tgid);
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trace_seq_printf(s, "(%7d) ", tgid);
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}
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trace_seq_printf(s, "[%03d] ", iter->cpu);
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@ -636,7 +636,7 @@ int trace_print_lat_context(struct trace_iterator *iter)
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trace_find_cmdline(entry->pid, comm);
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trace_seq_printf(
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s, "%16s %5d %3d %d %08x %08lx ",
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s, "%16s %7d %3d %d %08x %08lx ",
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comm, entry->pid, iter->cpu, entry->flags,
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entry->preempt_count, iter->idx);
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} else {
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@ -917,7 +917,7 @@ static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
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S = task_index_to_char(field->prev_state);
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trace_find_cmdline(field->next_pid, comm);
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trace_seq_printf(&iter->seq,
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" %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
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" %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
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field->prev_pid,
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field->prev_prio,
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S, delim,
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Block a user